package collection;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;

/**
 * 集合转数组
 */
public class CollectionToArray {
    public static void main(String[] args) {
        Collection<String> c = new ArrayList<>();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        System.out.println(c);//[one, two, three, four, five]

        /**
         * 若参数数组元素个数==集合元素个数，那就正常转换
         * 若参数数组元素个数<集合元素个数，那就正常转换（按照集合大小给数组）
         * 若参数数组元素个数>集合元素个数，那也正常转换，同时在末尾不默认值
         */
//        String[] array1 = c.toArray(new String[4]);
//        System.out.println(Arrays.toString(array1));
        String[] array2 = c.toArray(new String[5]);
        System.out.println(Arrays.toString(array2));
        String[] array3 = c.toArray(new String[3]);
        System.out.println(Arrays.toString(array3));


    }
}
